General Tuning Discussion

I am having an issue with my haltech ECU loosing connection with the laptop when making changes (as indicated by the * in the lower left corner)

pretty much runs perfect, connect a laptop make large changes, the * stays on. about 5 seconds later the engine dies and the laptop looses connection with the ecu and then the ecu cycles on and off and n and out of connection. to fix you turn the ecu off and on, then reconnect with the laptop.

now the ecu was sent back to haltech and bench tested with no issues.

tried 3 usb cords and two different laptop (tuners laptop which tunes 100's cars) and the issue still occurs.

I wired the ecu my self with soldered connections (I now know better) so the next issues is the wiring so what do you guys suggest to help diagnose?

first off I want to see if I can fault with the engine not running, if I cant then this to me suggests an interference issue.

if it does fault with the above test I was going to remove the secondary (smaller connector) and repeat, this would then rule out air and water temp sensors as well as the switches for launch and datalog.

looking for some trouble shooting tips please guys.

engine is a gen 3 3sgte from a ST205 celica running 1zz COP and other wise stock, can wideband and racepak dash.. if it helps